Abnormal retention of X-irradiated ataxia-telangiectasia fibroblasts in G2 phase of the cell cycle: cellular RNA content, chromatin stability and the effects of 3-aminobenzamide.

Abnormal retention of X-irradiated ataxia-telangiectasia fibroblasts in G2 phase of the cell cycle: cellular RNA content, chromatin stability and the effects of 3-aminobenzamide.
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X 射线照射的共济失调毛细血管扩张成纤维细胞在细胞周期 G2 期的异常保留:细胞 RNA 含量、染色质稳定性和 3-氨基苯甲酰胺的作用。

DOI:
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发表时间:
1985
期刊:
International Journal of Radiation Biology and Related Studies in Physics Chemistry and Medicine
影响因子:
--
通讯作者:
J. Watson
J. Watson
中科院分区:
--
文献类型:
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作者:
P. Smith;C. Anderson;J. Watson

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我们已经解决了 SV40 转化的共济失调毛细血管扩张 (A-T) 成纤维细胞对 X 辐射的异常敏感性的三个方面,即: (a) 通过流式细胞术分析的细胞周期遍历中的放射源扰动; (b) 3-氨基苯甲酰胺敏感过程在细胞活力恢复和 G2 + M 期延迟释放方面的参与; (c) 使用吖啶橙作为细胞 RNA 含量和染色质结构的探针,观察延迟在 G2 + M 期的细胞的功能和结构完整性。我们报告说,尽管 A-T 细胞具有合成核糖体 RNA 和维持染色质结构完整性的能力,但由于缺乏恢复过程,A-T 细胞在 G2 + M 期表现出剂量依赖性和与生存相关的异常保留。有证据表明,恢复过程取决于正常细胞和 A-T 细胞中的聚(ADP 核糖基)化活性,但后者细胞类型的恢复潜力在 X 射线剂量方面迅速饱和。
We have addressed three aspects of the abnormal sensitivity of SV40 transformed ataxia-telangiectasia (A-T) fibroblasts to X-irradiation, namely: (a) the radiogenic perturbations in cell-cycle traverse analysed by flow cytometry; (b) the involvement of 3-aminobenzamide-sensitive processes in cellular recovery in terms of viability and release from G2 + M phase delay; and (c) the functional and structural integrity of cells delayed in G2 + M phase using acridine orange as a probe for cellular RNA content and chromatin structure. We report that A-T cells show a dose-dependent and survival-related abnormal retention in G2 + M phase due to the lack of a recovery process, despite the capacity of such cells to synthesize ribosomal RNA and maintain the structural integrity of chromatin. Evidence is presented that the recovery process is dependent upon poly(ADP ribosyl)ation activity in both normal and A-T cells except that in the latter cell type recovery potential is rapidly saturated in terms of X-ray dose.
DOI: 10.1016/0014-4827(81)90006-9
发表时间: 1981-01-01
影响因子: 3.7
作者:
DARZYNKIEWICZ, Z;TRAGANOS, F;MELAMED, MR
通讯作者: MELAMED, MR
DOI: 10.1016/0167-4781(83)90039-8
发表时间: 1983
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Smith,PJ;Paterson,MC
通讯作者: Paterson,MC